Ah - I've used S2 in the past. Great work. It scales really well for larger datasets.
Interesting that you mention the use of multiple hilbert curves as well. We also experimented with two Hilbert Curves, rotated by 90 degrees. This helps to get around what we've dubbed the "Hilbert Equator" problem where two objects are quite far on the curve because they are placed close to one of the major fault lines in the fractal (for lack of a better word)
Interesting that you mention the use of multiple hilbert curves as well. We also experimented with two Hilbert Curves, rotated by 90 degrees. This helps to get around what we've dubbed the "Hilbert Equator" problem where two objects are quite far on the curve because they are placed close to one of the major fault lines in the fractal (for lack of a better word)